I love this quote from Parker Palmer. It comes from his wonderful book Let Your Life Speak.
“Vocation does not mean a goal that I pursue. It means a calling that I hear. Before I can tell my life what I want to do with it, I must listen to my life telling me who I am. I must listen for the truths and values at the heart of my own identity, not the standards by which I must live – but the standards by which I cannot help but live if I am living my own life.”